Using dblink to access another posgresql database

["Manasi Save" <manasi.save@xxxxxxxxxxxxxxxxxxxxxx>]

Hi All,
 
I want to access different databases from one postgresql database stored
function.
 
Will this affect the performance of my database, as I need to specify
host,port,dbname for each query. so will it be time consuming?
 
Thanks in advance.
 
Regards,
Manasi